What would you do?

You're standing on a street corner, just exiting a store. You hear the bang, bang, of two gunshots going off.

You're temporarily dumbstruck, but you gather yourself to assess whether or not you're in any immediate danger. A car sits silently in the middle of the street, the driver slumped over the steering wheel. People are scattered everywhere and there is a great deal of screaming and yelling. Your eyes dart around, and you see a late-teen aged boy/man running away from the scene. You recognize him, and you know of his reputation for hanging out with the wrong people and his propenisty for getting into trouble with the law.

4 months later, you testify in court and identify the young man you saw running. It turns out he didn't have anything to do with the shooting whatsoever.

Do you feel bad that you gave your testimony?